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In composite materials, standard metalcutting drill or end mill designs would be like to wear quickly and/or produce defects such as delamination. Various alternative cutting tool designs have succeeded in milling and drilling various composite materials. Cutting tool supplier Onsrud offers this summary of some cutting tool designs for composites and how the tools are used.

Solid Carbide Kevlar Drill

■ Designed to produce a clean hole in Kevlar materials.

■ The point geometry prevents whiskers and delamination during drilling.

■ Developed as an improved burr design. The design offers more cutting edges than a standard burr and the chipbreaker/finisher edges reduce the cutting forces, allowing the tool to be fed at a higher feed rate.